Wojciech J. Kinart

2-Methoxyethanol–Tetrahydrofuran–Binary Liquid System. Viscosities, densities, excess molar volumes and excess Gibbs activation energies of viscous flow at various temperatures

Densities (d12) and viscosities (η12) have been measured for 2-methoxyethanol (ME) with tetrahydrofuran (THF) binary liquid mixtures over the whole composition range at various temperatures ranging from 291.15 to 308.15 K. The experimental data were used to test some empirical equations of the type: y12=y12(t) and y12=y12(X1) [where: y12−d12 or η12]. From all these data, the excess molar volumes (V12E), the excess viscosities (η12E) and excess Gibbs activation energies (ΔG*) of viscous flow were calculated. These structural parameters as a function of concentration suggest the formation of 3ME⋅THF and 2ME⋅THF types of intermolecular complexes.

Physicochemical properties of dimethyl sulfoxide–methanol liquid mixtures. Experimental and semiempirical quantum chemical studies

The 1H NMR spectra of liquid binary mixtures of dimethyl sulfoxide (DMSO) and methanol (MeOH), were recorded at 298 K over almost the whole range of the mixed solvent compositions. From these data were found the values of the spectral parameter, Δδ(DMSO–MeOH). The densities (d12) and viscosities (η12) of the mixed solvent were measured at 298.15 K, as well as the relative permittivities (Iµ12) at 293.15, 298.15, 303.15 and 308.15 K. From all these data, the molar volumes (V12) and their deviations from ideality were calculated. Additionally, the temperature coefficients of relative permittivity, α12, were found. These structural parameters of functions of concentration suggest the formation of stable DMSO–MeOH and DMSO–2 MeOH type complexes. The semiempirical quantum chemical (MOPAC package) method was applied to optimize the geometry, energy and hydrogen-bond lengths of dimers and trimers formed by molecules of dimethyl sulfoxide and methanol, and these conclusions wholly support the conclusions drawn from the physicochemical studies.

Dimethylsulfoxide - N, N- dimethylformamide binary mixtures and their physicochemical properties

Abstract Density and refractive indices for mixtures of dimethylsulfoxide (DMSO) with N.N-dimethylformamide were measured over the whole composition range at 298.15 K, as well as the relative permittivities at 288.15 K, 293.15 K, 298,15 K, 303,15 K and 308.15K. From these data the excess molar volumes, apparent and partial molar volumes of DMSO and DMF, the excess relative permittivity, the temperature coefficients of relative permittivity and Kirkwoods correlation factor for investigated mixtures were calculated. The 1H-NMR spectra of these liquid binary mixtures, were recorded at 298 K and the spectral parameters, Δδ(DMSO - DMF) were calculated. These structural parameters as functions of concentration suggest the formation of the most stable “complexes” of the 2 DMSO•DMF and DMSO•DMF types.

Studies on the catalysis of the reaction of organotin phenoxides with diethyl azodicarboxylate by lithium perchlorate

Organotin phenoxides react at room temperature with diethyl azodicarboxylate in diethyl ether, in the presence of lithium perchlorate, give the corresponding ring-aminated phenols in excellent yield.

Acetonitryle : Water binary mixtures and their assumed internal structures

The 1 H-NMR spectra of liquid binary mixtures, acetonitryle (ACN) - water (H 2 O), were recorded at 298 K and the spectral parameters, Δδ(ACN-H 2 O) were evaluated. The surface tensions (σ 12 ) were measured at 298.15 K. From literature values of density (d 12 ), viscosity (η 12 ), relative permittivities (e 12 ) and measured surface tensions the values of molar volumes (V 12 ) and their deviations from ideality were calculated. Further on the temperature coefficients of relative permittivity, α 12 =(1/e 12 ).[de 12 /d(1/7)], were evaluated. These structural parameters as functions of concentration suggest the formation of the intermolecular complexes of the ACN. 2H 2 O, ACN. H 2 O, 2 ACN. 3H 2 O and 2 ACN. 3 H 2 O types.

ELECTROCHEMICAL STUDIES OF 2-HYDROXY-3-(3,4-DIMETHYL-9-OXO-9H-THIOXANTHEN-2-YLOXY) N,N,N-TRIMETHYL-1-PROPANIUM CHLORIDE

Lelectrooxydation et lelectroreduction du Quantacure QTX sur une electrode cylindrique de platine sont examinees

Some Physicochemical Properties of Acetonitryle-Methanol Binary Liquid Mixtures

Abstract Density and refractive indices for mixtures of acetonitryle with methanol were measured over the whole composition range at 298.15 K, as well as the relative permittivities at 288.15 K, 298.15 K and 308.15 K. From these data the excess molar volumes, apparent and partial molar volumes of acetonitryle and methanol, the excess relative permittivity, the temperature coefficients of relative permittivity and Kirkwoods correlation factor for investigated mixtures were calculated. The 1H-NMR spectra of these liquid binary mixtures, were recorded at 298 K and the spectral parameters, ΔΔ(ACN-MeOH) were calculated. These structural parameters as functions of concentration suggest the formation of the structures such as clathrate and the most stable complexes of the 2 ACN • MeOH and ACN • 3MeOH types.

Studies on the intermolecular interactions in the binary mixtures of nitrobenzene with 2-methoxyethanol, 2-ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol at T = 298.15 K

Densities, viscosities and speeds of sound, at Tu2009=u2009298.15u2009K, in the binary mixtures of nitrobenzene with 2-methoxyethanol, 2-ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol have been measured as a function of composition. From the experimental data excess molar volumes V E, excess energies of activation for viscous flow (G* E), excess isentropic compressibility ( ) and the deviations in the viscosity (Δlnu2009η) from a mole fraction average have been calculated. The viscosity data were correlated with equations of Hind et al., Grunberg and Nissan, Frenkel, and McAllister. The results are discussed in terms of intermolecular interactions and structure of studied binary mixtures.

Physicochemical properties and internal structures of dimethyl sulfoxide-1-propanol liquid mixtures

Abstract The 1H-NMR spectra of liquid binary mixtures of dimethyl sulfoxide (DMSO) and 1-propanol (PrOH), were recorded at 298 K over almost the whole range of the mixed solvent compositions. From these data were found the values of the spectral parameter, Δδ(DMSO-PrOH). The densities (d 12) and viscosities (η12) of the mixed solvent were measured at 298.15 K, as well as the relative permittivities (∊12) at 293.15 K, 298.15 K and 303.15 K. From all these data, the molar volumes (V12) and their deviations from ideality were calculated. Additionally, the temperature coefficients of relative permittivity, α12, were found. These structural parameters of functions of concentration suggest the formation of stable DMSO-PrOH, DMSO-2PrOH and DMSO-3PrOH type complexes.

Study of the Intermolecular Interactions in Liquid N,N-Dimethylacetamide-Water Mixtures

Abstract The 1H-NMR spectra of the liquid binary mixtures, N,N-dimethylacetamide (DMA)-water, were recorded at 298 K within nearly the whole range of the mixed solvent compositions. From these data the values of the spectral parameter, Δδ(DMA-H2 O) were found. The viscosities and surface tensions of the mixed solvents were measured at 298.15 K, as well as the dielectric permittivities at 288.15 K, 298.15 K and 303.15 K. From all these new parent data, the values of molar volumes and their deviations from “ideality” were calculated. Additionally, the values of the temperature coefficients of dielectric permittivity were found. These structural parameters as functions of concentration suggest the formation of the most stable “complex” (sub-unit) of the DMA·2H2O type.